Layout a flex box similar to a table?

This code works for me:

        * {
            box-sizing: border-box;
        }


        body, html {
            height: 100%;
            margin: 0;
        }


        #container {
            width: 400px;
            display: flex;
            flex-direction: column;
            justify-content: flex-start;
            align-items: flex-start;
            background-color: lightgrey;
            padding: 10px;

        }


        .shelf {

            flex: 1 1 auto;
            width: 100%;
            margin-bottom: 10px;
            border: 1px solid black;
            background-color: lightgreen;

            display: flex;
            flex-direction: row;

        }
        .shelf:last-child {
            margin-bottom: 0;
        }


        .labelbox {
            flex: 0 0 35%;
        }


        .valuebox {
            flex: 0 0 65%;
        }
<div id="container">

    <div class="shelf">
        <div class="labelbox">Name: </div> <div class="valuebox">Barry Carter</div>
    </div>

    <div class="shelf">
        <div class="labelbox">DOB:</div><div class="valuebox">10/12/1980</div>
    </div>

    <div class="shelf">

        <div class="labelbox">
            Description:
        </div>

        <div class="valuebox">

            This content goes on and on and will force the height to expand. And the label box to the left will
            "move" with it. There need not be much of a relation other than that their parent div/flex-container is
            getting taller as well.

        </div>

    </div>

    <div class="shelf">
        <div class="labelbox">Group:</div><div class="valuebox">Advanced</div>
    </div>

    <div class="shelf">
        <div class="labelbox">End Date:</div><div class="valuebox">2020-09-20</div>
    </div>

</div>

header, .row {
  display: flex;  /* aligns all child elements (flex items) in a row */
}

.col {
  flex: 1;        /* distributes space on the line equally among items */
}
<section>
  <header>
    <div class="col">Column A</div>
    <div class="col">Column B</div>
    <div class="col">Column C</div>
  </header>
  <div class="row">
    <div class="col">1</div>
    <div class="col">2</div>
    <div class="col">3</div>
  </div>
</section>

If the content you are going to present is of type tabular data, then a table is the proper way.

HTML 5.1 W3C Recommendation, 1 November 2016, 4.9 Tabular data

Given that you can't, or don't want to, alter the markup, this can be done using CSS Table, and with that easily swap between any display type such as flex, block, etc., or even float, using media query etc.

I also removed the <div class="line-break"></div> element, since you don't need, though if it is rendered by a component or similar, leaving it as is won't cause any problem.

Using CSS Table

section {
  display: table;
  width: 100%;
}

section > * {
  display: table-row;
}

section .col {
  display: table-cell;
}
<html>
  <head>
  </head>
  <body>
    <section>
      <header>
        <div class="col">Column A</div>
        <div class="col">Column B</div>
        <div class="col">Column C</div>
      </header>
      <div class="row">
        <div class="col">1</div>
        <div class="col">2</div>
        <div class="col">3</div>
      </div>
    </section>
  </body>
</html>

If you still need, or have to, use Flexbox, this answer of mine mention the difference between CSS Table and Flexbox on two important features:

  • Can flexbox handle varying sizes of columns but consistent row height?

Updated, a sample showing some useful Flexbox stuff, with varying width's and span columns.

Using Flexbox

.tbl {
  display: flex;
  flex-direction: column;
}
.row {
  display: flex;
  min-height: 50px;
}
.cell {
  flex: 4;
  border: 1px solid red;
}
.cell:nth-child(1) {
  flex: 1;
}
.cell:nth-child(2) {
  flex: 2;
}
.cell.span4-5 {
  flex: 8 24px;                    /*  col 4,5 flex-grow/border/padding  */
}
.cell.span3-4 {
  flex: 8 24px;                    /*  col 3,4 flex-grow/border/padding  */
}
.cell.span3-5 {
  flex: 12 36px;                   /*  col 3,4,5 flex-grow/border/padding  */
}
.row:first-child .cell {
  display: flex;
  justify-content: center;         /*  center horiz. */
  align-items: center;             /*  center vert. */
}
.row .cell {
  padding: 5px;
  box-sizing: border-box;
}
<div class="tbl">
  <div class="row">
    <div class="cell">ID </div>
    <div class="cell">Nr </div>
    <div class="cell">Header 1 </div>
    <div class="cell span4-5"> Header 2 </div>
  </div>
  <div class="row">
    <div class="cell">1</div>
    <div class="cell">2</div>
    <div class="cell">Content</div>
    <div class="cell">Content</div>
    <div class="cell">Content</div>
  </div>
  <div class="row">
    <div class="cell">2</div>
    <div class="cell">3</div>
    <div class="cell span3-5">Content</div>
  </div>
  <div class="row">
    <div class="cell">1</div>
    <div class="cell">2</div>
    <div class="cell span3-4">Content</div>
    <div class="cell">Content</div>
  </div>
</div>

Use CSS Grid. You can style any table the way you like.

Keep in mind If your table is more than 700 rows, the fram rate will start to drop, no matter what js framework you use. react, angular, vue or vanila JS. the scrolling will get real laggy.

And the maximum you row can use is 1000. More than that the extra row will create bad graphic. But you wont reach 1000 anyway, because at 700th row, the scrolling speed, starts to get bad.

If somehow you need to display more than 1000 rows, you will visualized lib. Every js framework has a lib to do so. Basically, it will render the rows in the view port. The rows that not in the view port will not be rendered. They will only be rendered when user scrolls.

This is year 2021, chances you read this answer in the future, the browsers vendor might probably fix the performance of 1000 rows, they might even extend that limit. So try it out.

Tags:

Html

Css

Flexbox